How does spacecraft navigate in space if it's destination is one of the Lagrange points?

How does spacecraft navigate in space if it's destination is one of the Lagrange points?
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Answer :

Another great question about about one of the incredible acheivments engineers, astronomers, and physicists have managed – while our politicians have been shoving their heads deeper up their asses. Your answer is here: https://timeandnavigation.si.edu/navigating-space/deep-space And here: https://m.youtube.com/watch?v=61ZV6IsqnwQ Basically, as @zenvelo points out below, it involves triangulation similar to that used for 4 centuries by earth explorers at sea. But for missions far into deep space and beyond earth based telemetry NASA scientists are already developing technology that will allow future spacecraft to find theur way independently.
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